Oh lala. Just rock the caps like that. Different on the other side. Best of both worlds car looks awesome bro.
Have u thought of getting oem e90 m3 rear? To make that ass even more rounder

To be honest, I thought about it after seeing how nice Justin's "Project Erica" turned out with the rear diffuser and all, but I'm sticking with my guns as I actually like the M3 rep more even though it's molded from an E92 M3 rear. I think it makes the car look slightly more aggressive; especially with the CSL trunk.

Pics of Justin's OEM E90 M3 rear, custom molded to fit on his E90 335i (performed by none other than LTBMW). Unfortunately, he had a fender bender but then took advantage of it to add the custom rear vents.